Question

simplify..
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Answer 1

Answer:

-4 is answer

Explanation:

${a}^{2} - {b}^{2} = (a + b)(a - b)$

this is the formula

Answer 2

Answer:

$using \: formula \: (a + b)(a - b) = ( {a }^{2} - {b}^{2} )$

$3 - 7$

$- 4$